[SR-Users] cdr processing questions

A few question; Firstly With mod acc and acc_cdr i see the default fields logged is only start_time, end_time, duration. This is an actual entry logged. start_time, end_time, duration 1515353126, 1515353135, 9.660000 Why is the duration 9.660000? It seems wrong because it is more then the difference in time 1515353135 - 1515353126 = 9 Secondly What is a reliable way to capture and log start time, answer time, and end time. How do I get the duration info. a) start time to end time. b) answer to end time. Is there an built in variable that store this info? Thirdly dialog events listed as: event_route[dialog:start] event_route[dialog:end] event_route[dialog:failed] There does not seems to be a event for answer so then how to be notified when a dialog is answered? Regards